ICD-10 Code J11.2 – Influenza due to unidentified influenza virus with gastrointestinal manifestations (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J11.2 – Influenza due to unidentified influenza virus with gastrointestinal manifestations
What it is
This code identifies influenza caused by an unspecified influenza virus when gastrointestinal symptoms are part of the illness. Use it for flu cases documented with stomach or intestinal involvement, not a named virus strain.
Clinical signs
Typical influenza findings may include fever, cough, sore throat, body aches, and fatigue, with added gastrointestinal complaints such as nausea, vomiting, abdominal pain, or diarrhea. Clinical features vary; refer to documentation.
When to use this code
Use J11.2 when the provider documents influenza and notes gastrointestinal manifestations, but does not identify influenza A, B, or another specific virus. It may also fit when the record clearly describes flu with GI symptoms and the organism remains unspecified. Check documentation if the note is ambiguous.
Do not use for
Do not use this code for influenza with a documented virus type, such as influenza A or B, or for gastrointestinal illness without influenza. If the chart only says “viral gastroenteritis,” this code is not appropriate.
Coding tip
Confirm both influenza and gastrointestinal manifestations are documented before assigning J11.2.